Question

1. (x+4)(x+5) =
2.(3k-5)²=
3.(2mn³+7)(2mn²-7)=
​

Answer 1

Explicación paso a paso:

1.

$(x + 4)(x + 5) \\ {x}^{2} + 5x + 4x + 20 \\ {x}^{2} + 9x + 20$

2.

${(3k - 5)}^{2} \\ 9 {k}^{2} - 2(15k) + 25 \\ {9k}^{2} - 30k + 25$

3.

$(2m {n}^{2} + 7)(2m {n}^{2} -7) \\ 4 {m}^{2} {n}^{4 } - 49$

Espero te sirva